Skim-gate for molds.



No. 772,720. PATENTED OCT. 18, 1904.

' A. LADWIG.

SKIM GATEYFOR MOLDS. APPLIGATIoN-IILBD un. 1s, 1904.

No MODEL.

UNITEDv STATES Patenteaoetober 1s, 1904. l

AUGUST LADWIG, OF MILWAUKEE, WISCONSIN.

sKlNl-eATE Fon MoLDs. i f

SPECIFICATION forming part `of Letters PatntNo. 772,720, dated October 18, 1904.

Appiicaiion ined iipiii 18, 1904.

.To all whom it may concern,.- v

Be it known that I, AUGUST LADWIG, residing in Milwaukee, in the county of Milwaukee and State of Wisconsin, have invented new and useful Improvements in Skim-Gates for Molds, of which the following is a description, reference being had to the accompanying drawings, which are apart of this specification. l

This invention relates to skim-gates for molds, and has for its object to prevent dross or slag from entering the matrix of the mold.

Another object of this invention is to accomplish the above result by the employment of a straining-core of novel construction.

With the above and other objects in View the invention consists in the devices and parts and their equivalents, as hereinafter set forth.

Referring to the accompanying drawings, .in which like characters of reference indicate the same parts in the several views, Figure 1 is a vertical transverse section of a molders flask employing a skimgate in accordance with this invention. Fig. 2 is a similarview thereof, taken on a plane at right angles to In the views, 10 represents theA cope, and- 11 the drag, of a molders flask, the partingline between the sand ofv the cope and drag being represented by the line 12.

The drag-pattern, as shown in Figs. 3, 4, and 5, comprises a rectangular iiat core-print pattern 13 with,downwardly-beveled' edges and a channel-pattern 14.' secured to the under side thereof and extending from one end of the core-pattern to near the other end thereof and having its sides and ends tapering toward its bottom, which is rounded.

The channel-pattern lltextends along the center line of the ycore-print pattern 13 and is considerably narrower than the core-print Serial No. 203,539. (No model.)

' pattern, leavingthe edges of said core-print pattern extending beyond the channel-pattern to form opposite projecting side shoulders 15 of the side vedges of the core-print pattern, and the channel-pattern being shorter than the core-print pattern a corresponding projecting end shoulder 16 is produced by the end of the core-print pattern.

. The cope-pattern consists of the gate-pattern 17, which is approximately rectangular in shape, lbut has at one end a projecting circular portion 18 with inclined edges 19, connecting it with the edges of the main portionof the gate pattern, and this .gate pattern is provided with upwardly beveled edges throughout its contour and has its flat bottom in close contact with the at top of the core-print pattern and is secured in proper position thereon by dowel-pins 2O on the bottom of thevgate-pattern, fitting in corresponding sockets in the top ofthe core-print pattern. The gate-pattern 17 is provided in its upper surface with a groove 21, which extends longitudinally of the gate-core from the circular portion 18 thereof to the other end Vof said gate-core, and this groove 21 is provided with upwardly-beveled edges.

The ingate-core 22 is of the usual shape, being 'slightly' conical with a downward taper and beingadapted to fit uponthe rounded portion 18 of the gate-pattern.

The impression produced in the sand of the drag and cope by the drag and cope patterns, respectively, forms a channel lt'in the sand of the drag with a core-seat thereabove consijsting of shoulders 15 along the side edges of the channel and the shoulder 16' at the end of the channel, and immediately thereabove in the sand of the cope is produced the gate 17', extending from the ingate 22v over the entire core-seat, with the exception ofv the extreme side edges of the coreseat,.which are slightly wider than the gate. rIhe gate 17 has a depending flange 21', formed in its upper wall by the groove 21V of the gate-pattern and which extends from the ingate 22 to the end of the gate 17.

By means other than the patterns above described one or more gates 23 are produced in the drag-sand leading from the channel 14 to 14 therebeneath.

thematrix of the mold, (not showin) and these l 14, and consequently the metal fed therefrom gates may lead from one side of the channel 14 only or may lead from both sides thereof.

A core 24, formed of clay or oil-sand or any other suitable material, of the same shape and size as the core-printpattern is provided with rows of downwardly-Haring perforations 25. rlhis core is fitted upon the core seat, as shown in Figs. 1 and 2, the gates 23 being shaped to avoid it and being closed from the channel 14 to the parting-line 12 by the surface of said core.

When the flask is closed and metal is introduced through the ingate 22, it flows over the core 24 and passing through the perforations 25 thereof drops into the channel r1`he metal being' admitted to the gate 17 faster than it passes down through the perforations 25 of the core rises in the gate 17, and all dross or slag therein being lighter than the pure metal will rise in the gate 17' on either side of the depending flange 21 and leave only the pure metal to pass through the openings 25.y The depending flange 21', extending down to near the upper ends of the openings 25, prevents the impurities locating directly above the openings 25, and so keeps these openings free from such impurities. The depending flange 21 separates the pair of parallel feed-passages on its sides, which carry the fresh metal direct from the ingate 22 to the farther end of the core and feed all of the openings of the core 24 alike. These feed-passages are sufheiently high to contain all of the impurities and still allow for free passage of the metal therethrough. The depending flange 21 by extending down below the level of the flowing impurities prevents said impurities locating directly above the openings of the core-plate, where they might be sucked down therethrough; and, further, said depending flange by standing close to the core-plate and above the openings keeps within the feed-passages and away from the openings of the core-plate such large solid impurities as would be liable to stop up the said openings.

The seating of the core on the shoulders 15 provides a strong support therefor without liability of the core scraping loose sand into the channel 14 to be carried into the matrix of the mold with the metal.

The gates 23 leading from the channel 14 to the matrix of the mold may, if desired, be produced by suitable patterns therefor, but being entirely on the surface of the dragsand they are preferably merely eut by means of the ordinary trowel. The edge of the core serves as a wall for the gates, rendering a tubular construction thereof unnecessary, and thereby avoiding the necessity for employing a horn-gate or the like with the consequent infirm walls of the gates.

Only the pure metal which passes through the core-perforations 25 enters the channel by the gates 23 to the matrix of the mold will be free of impurities and result in a highquality homogeneous casting.

,lhe perforated core-plate prevents any solid impurities contained in the metal passing to the lnatrix of the mold, and thereby constitutes a strainer for the metal, and the perforations thereof being flaring with their smaller ends uppermost prevent a solid body lodging therein should it succeed in entering the upper end, the lower part of the channel 14 being depended upon to collect such solid bodies as may pass through the contracted upper ends of the perforations.

Thile the skim-gate of this invention is here shown and described as adapted to be located so that the top surface of the core is fiush with the parting-line between the cope and the drag, it is obvious that this particular relation is not necessary to the successful operation of the invention, and therefore I do not wish to be limited in this respect, and, furthermore, other obvious changes may be made in the details of the construction and arrangement of parts withoutI departing from the spirit and scope of this invention.

Vhat I claim as my invention is 1. In a skim-gate for molds, a gate, a perforated core therefor through the perforations of which the pure metal may pass, shoulders supporting the core, and a channel connecting said perforations with the matrix of the mold.

2. In a skim-gate for molds, a gate adapted to collect impurities of the metal, a perforated core closing the bottom thereof, shoulders supporting the core, and a channel conneting the perforations of the plate with the matrix of the mold.

3. In a skim-gate for molds, a gate adapted to collect the impurities of the metal and having a perforated bottom through which the pure metal may pass, the perforations of the bottom being flaring in the direction of iiow of the metal therethrough, and a channel for conveying the pure metal from the perforated bottom of the gate to the matrix of the mold.

4. In a skim-gate for molds, a gate adapted to collect the impurities from the metal, a perforated core forming the bottom thereof, a channel located beneath the perforated core to receive the pure metal passing through the perforations of the perforated core, and a gate connecting the channel with the matrix of the mold and being formed by a groove closed by said core.

5. In a skim-gate for molds, a gate adapted to collect impurities of the metal, a perforated core forming the bottom of the gate, a flange depending from the top wall of the gate and located above the perforations in the core, and a channel for conducting the metal from the perforations of the core to the matrix of the mold.

6. In a skim-gate for molds, a channel hav- IOO ing shoulders, a perforated cores'eated upon the shoulders of 'the channel, and a gate located above the perforated core and adapted to collect the impurities of the metal, said channel having connection With the matrix of theV 7. In a skim-gate for molds, a channel having shoulders, a perforated core seated upon the Shoulders of the channel, a gate located above the perforated core and adapted'to collect the impurities of the metal, and a gate leading from the channel around the edge of the perforated core to the matrix of themold.

8. In a skimfgate for molds, a channel having shoulders, a perforated core seated upon the shoulders of the channel, a gate `located above the perforated coreand adapted to collect the impurities-of the metal, a depending -iiange on the upper Wall ofthe gate and located above the perforations of the core, and a gate connecting the channel with the matrix of the mold. v

9. vIn a skim-gate for molds, a mold-Hash ,having a channel provided With shoulders formed in the drag, a perforated core seated uponsaid shoulders, a gate formed in the cope above the perforated core, andagate leading from the channel to the `matrix of the` mold.YA

10. In a skim-gate for molds, a mold-Hash having a shouldered channel formed in its drag, a perforated core seated upon the shoulders, a gate formed in the drag around the edge of the perforated core and extendingl from the channel to the matrix of the mold, and a gate formed in the cope above the perforated core and provided with a depending flange located above the perforations of the core.

' v 11. In a skim-gate for molds, a mold-flask having a shouldered channel in its drag, a core the upper Wall of said skim-gate above the perforations of the core, and an ingate connecting With said skim-gate.

In testimony whereof I aiiix my signature in presence of two Witnesses.

AUGUST LADWIG. Witnesses:

A. L. MoRsELL, HALBERT C; CARTERQ 

